You can get your hands on Windows 10's big May update before everyone else, but you should remove your external storage devices before you proceed.
Windows 10 May update has a weird bug where it was found to be reassigning drive letters for external storage devices. For instance, if you have a USB hard drive that shows up as the D: drive, the update could shuffle it to the E: drive. As a result, Microsoft is blocking the update from installing on PCs that have USB storage or SD cards attached to them:
If you have a USB drive plugged into your PC and try to install the May update, you'll get a message that says, "This PC can't be upgraded to Windows 10." Thankfully, there's a pretty straightforward fix: just remove whatever external storage device that's attached to your PC, and you'll be able to install the update just fine. From Microsoft:
As noted by Ars Technica, this isn't the first time a Windows update messed with drive letter assignment. Build 1803 would randomly assign letters to recovery partitions, and then deliver incessant notifications about disc space running out. It's a much more manageable issue, but it's still weird that Microsoft wasn't able to catch this during early beta tests.
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Harish Jonnalagadda is a Senior Editor overseeing Asia for Android Central, Windows Central's sister site. When not reviewing phones, he's testing PC hardware, including video cards, motherboards, gaming accessories, and keyboards.